/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>

#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_debug.h>

static int
lcore_hello(__attribute__((unused)) void *arg)
{
	unsigned lcore_id;
	lcore_id = rte_lcore_id();
	printf("hello from core %u\n", lcore_id);
	return 0;
}

int
main(int argc, char **argv)
{
	int ret;
	unsigned lcore_id;
	

	/**************************************************
	* Function:rte_eal_init(int argc,char **argv);
	* 初始化基础运行环境
	* 配置初始化
	* 内存初始化
	* 内存池初始化
	* 队列初始化
	* 告警初始化
	* 中断初始化
	* PCI 初始化
	* 定时器初始化
	* 检测内存本地化（NUMA）
	* 插件初始化
	* 主线程初始化
	* 轮询设备初始化第 1 章　认识 DPDK 19
	* 建立主从线程通道
	* 将从线程设置在等待模式
	* PCI 设备的探测与初始化
	*
	* 入口参数是启动 DPDK 的命令行，可以是长长的一串很复杂的设置
	* 对于这个实例，最需要的参数是“-c <core mask>”，线程掩码（core mask）指定了需
	* 要参与运行的线程（核）集合。
	**************************************************/
	
	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		rte_panic("Cannot init EAL\n");



	/* call lcore_hello() on every slave lcore */
	/***********************************************
	* Function:RTE_LCORE_FOREACH_SLAVE(unsigned lcore_id);
	* RTE_LCORE_FOREACH_SLAVE（lcore_id）如名所示，启动多核运行环境， 遍历所有
	* EAL 指定可以使用的 lcore
	************************************************/
	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
		/*
		* Function:rte_eal_remote_launch();
		* 通过 rte_eal_remote_launch 在每个 lcore 上，启动被指定的线程
		*@ 第一个参数是从线程，是被征召的线程；
		*@ 第二个参数是传给从线程的参数；
		*@ 第三个参数是指定的逻辑核，从线程会执行在这个 core 上
		*/
		rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
	}

	/* call it on master lcore too */
	lcore_hello(NULL);

	rte_eal_mp_wait_lcore();
	return 0;
}
